update docs around rendering in controllers (#1404)

* update docs around rendering in controllers
see #1322

* vale

* grammar

* Update docs/guide/getting-started.md

Co-authored-by: Simon Fish <si@mon.fish>

Co-authored-by: Simon Fish <si@mon.fish>

docs/CHANGELOG.md

@@ -9,6 +9,10 @@ title: Changelog
 
 ## main
 
+* Update docs to reflect lack of block content support in controllers.
+
+    *Joel Hawksley*
+
 * Prevent adding duplicates to `autoload_paths`.
 
     *Thomas Hutterer*
@@ -18,6 +22,9 @@ title: Changelog
     *Simon Fish*
 
 * Include polymorphic slots in `ViewComponent::Base` by default.
+
+    *Cameron Dutro*
+
 * Add per-component config option for stripping newlines from templates before compilation.
 
     *Cameron Dutro*

docs/guide/getting-started.md

@@ -90,11 +90,11 @@ It's also possible to render ViewComponents in controllers:
 ```ruby
 # app/controllers/home_controller.rb
 def show
-  render(ExampleComponent.new(title: "My Title")) { "Hello, World!" }
+  render(ExampleComponent.new(title: "My Title"))
 end
 ```
 
-_In versions of Rails < 6.1, rendering a ViewComponent from a controller doesn't include the layout._
+_Note: Content can't be passed to a component via a block in controllers. Instead, use `with_content`. In versions of Rails < 6.1, rendering a ViewComponent from a controller doesn't include the layout._
 
 ### Rendering ViewComponents to strings inside controller actions